Smermesnil (French pronunciation: [smɛʁmenil]) is a commune in the Seine-Maritime department in the Normandy region in northern France.

A farming commune created from three ancient parishes and situated at the 2nd highest point in the department, between the valleys of the Yères and the Eaulne rivers in the Pays de Bray. The commune is about 17 miles (27 km) southeast of Dieppe at the junction of the D920, D14 and D59 roads.

Historical population

Year	Pop.	±% p.a.
1968	446	—
1975	285	−6.20%
1982	267	−0.93%
1990	218	−2.50%
1999	250	+1.53%
2007	366	+4.88%
2012	421	+2.84%
2017	407	−0.67%
Source: INSEE

• The château, built with stone from the ancient abbey de Foucarmont.
• The church of St. Martin, dating from the thirteenth century.
• The church of St. Jean, dating from the sixteenth century.
• The church of St. Madeleine, dating from the sixteenth century.

• Communes of the Seine-Maritime department